RNA Timer Management in Small Data Transmission
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing radio access network (RAN) notification areas (RNA) during small data transmission (SDT) procedures, particularly in 5G NR systems, leading to delays and resource consumption issues.
Innovation Solution
Implementing a periodical RNA mechanism as part of the SDT procedure, where user equipment (UE) receives an RNA timer configuration from the base station, transitions to an RRC inactive state, and manages the RNA timer accordingly, stopping it during SDT and restarting it upon completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UE transitions to RRC connected state for small data transmission, then data transmission can be performed, but delays and resource consumption increase
Solution Approach 1:
The patent segments the RRC connection state into two distinct states: RRC inactive state (for low-power operation with periodic RNA updates) and RRC connected state (for high-speed data transmission). This segmentation allows the UE to remain in the inactive state for most operations and only transition to connected state when actual data transmission is needed, thereby reducing unnecessary delays and resource consumption while maintaining data transmission capability when required.
2Productivity
If UE transitions to RRC connected state for small data transmission, then data transmission can be performed, but resource consumption increases
Solution Approach 1:
The patent implements dynamic state management where the UE can flexibly transition between RRC inactive and RRC connected states based on actual transmission needs. The UE monitors whether data transmission is required and only transitions to the power-intensive RRC connected state when necessary, while remaining in the low-power RRC inactive state otherwise. This dynamic approach optimizes power consumption while maintaining full data transmission capability when needed.
3Reliability
If periodic RNA updates are implemented, then location tracking is maintained, but timer management complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the RNA timer with a predetermined period when the UE transitions to RRC inactive state. The network side provides the timer configuration in advance, and the UE automatically manages the timer without requiring complex real-time calculations or manual intervention. This pre-configuration simplifies timer management while ensuring reliable periodic location tracking updates.
Data Source
AI summary
Apparatuses, systems, and methods for a user equipment device (UE) to perform a method for supporting a periodical radio access network (RAN) notification area (RNA) mechanism when small data transmission (SDT) is enabled for a user equipment device (UE). The method may include the UE receiving, from a base station, an indication enabling an SDT procedure along with an indication of an RNA timer configuration, transitioning, to a radio resource control (RRC) inactive state, and initiating an RNA timer based on the RNA timer configuration. The UE may, upon initiation of the SDT procedure, stop the RNA timer and, upon termination of the SDT procedure, start the RNA timer. During the SDT procedure, the UE may receive any of an SDT termination indication, an SDT subsequent transmission indication, or an SDT subsequent transmission termination indication that may include an updated RNA timer configuration (and/or RNA timer reconfiguration).